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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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Number of options outstanding, including both vested and non-vested options.

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Amount by which current fair value of underlying stock exceeds exercise price of fully vested and expected to vest options outstanding. Includes, but is not limited to, unvested options for which requisite service period has not been rendered but that are expected to vest based on achievement of performance condition, if forfeitures are recognized when they occur.

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Stock Based Compensation (Narrative) (Details) - USD ($)		1 Months Ended		3 Months Ended				6 Months Ended
	Feb. 06, 2025	May 31, 2025	Feb. 28, 2025	Jun. 30, 2025	Mar. 31, 2025	Jun. 30, 2024	Mar. 31, 2024	Jun. 30, 2025	Jun. 30, 2024
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Common Stock, Dividends, Per Share, Declared				$ 0.60		$ 0.57		$ 1.20	$ 1.13
Dividends, Common Stock, Cash				$ 258,467,000	$ 258,249,000	$ 241,296,000	$ 240,959,000
System Energy [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Dividends, Common Stock, Cash		$ 30,000,000	$ 20,000,000
Employee Stock Option
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				366,136		1,448,982		305,113	1,471,220
Forward Contracts [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Antidilutive Securities Excluded from Computation of Earnings Per Share, Amount				2,423,880		2,897,964		1,304,889	2,942,440
Equity Distribution Program [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Equity Distribution Sales Agreement, Increase in Maximum Aggregate Gross Sales Price			$ 1,500,000,000
Employee Stock Option \| 2019 Omnibus Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures			366,136
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Weighted Average Grant Date Fair Value			$ 17.43
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Number				3,132,728				3,132,728
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Outstanding, Weighted Average Exercise Price				$ 56.71				$ 56.71
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Vested and Expected to Vest, Outstanding, Aggregate Intrinsic Value				$ 78,600,000				$ 78,600,000
Restricted Stock [Member] \| 2019 Omnibus Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures	510,009
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 82.79
Long Term Performance Unit [Member] \| 2019 Omnibus Incentive Plan [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Options, Grants in Period, Net of Forfeitures	187,036
Percent of performance measure based on relative total shareholder return	80.00%							80.00%
Percent of performance measure based on environmental achievement measure	20.00%							20.00%
Long Term Performance Unit [Member] \| Performance measure based on relative total shareholder return [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 115.13
Long Term Performance Unit [Member] \| Performance measure based on the environmental achievement measure [Member]
Share-Based Compensation Arrangement by Share-Based Payment Award [Line Items]
Share-Based Compensation Arrangement by Share-Based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value	$ 82.79